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Set Book Picked Up Flag

Flash Isaac has a greater chance to spawn a Library if you touch a book. That behavior is built into this version of Isaac as well, but the STATE_BOOK_PICKED_UP flag never seems to get set. This mod sets the flag whenever you acquire a book.

See the wiki[bindingofisaacrebirth.fandom.com] for more information.

It seems that this behavior is likely on purpose[github.com], but you can enable it if you want to with this mod.

Mod Config Menu will let you choose what it means to pick up a book:

• Check the player's inventory : This allows us to check if the player acquired a book by any means including starting items or via the debug console. For starting items, we can load the first floor with the flag enabled.
  
• Check the player's queued item for a new book : This is a momentary check when the player grabs an item from a pedestal and holds it above his head. Characters like Judas (w/ The Book of Belial) won't set the flag at the start of the run which is similar to how Flash Isaac works. (Note: It's possible for another mod to clear the queue before we can check it. In that case, just switch to the other option.)

Update: If you have Repentogon, there's a new callback with better performance that we'll use. The option above will still let you differentiate between initial items and items you obtain later on.